Reactivity of carbanions of Fischer-type carbene complexes with pyrylium salts. Synthesis of new γ-methylenepyran carbene complexes via an addition-oxidation-deprotonation process

✍ Scribed by Bertrand Caro; Pascal Le Poul; Françoise Robin-Le Guen; Marie-Claude Sénéchal-Tocquer; Jacqueline Vaisserman

• Publisher: Elsevier Science
• Year: 1998
• Tongue: French
• Weight: 232 KB
• Volume: 39
• Category: Article
• ISSN: 0040-4039
• DOI: 10.1016/s0040-4039(97)10683-9

✦ Synopsis

The condensation reaction between y-unsubstituted pyrylium salts and carbanions of Fischertype cmbcne complexes allowed the synthesis of new y -methylenepyran carbene complexes. 13C NMR data and single cristal X-ray analysis suggest a delocalisation of the oxygene lone pair of the heterocycle.